I'm looking for a good algae scraper. Small to medium in size, thin to be able to get between rock an glass and it must be able to remove coraline.I bought a medium size Mag float which is totally useless on coraline and the harder algaes. It also seems to be to much my glass as it does the herky jerky. So I've put a scrubbing pad in between.

Any suggestions? Best bang for da buck?